Car Window Rain Awning - DIY
If you use the pull over-the-window mesh screens for ventilation, (or the plastic or wire gutter guards) this may be a way let the breeze in and keep the rain out. It's pretty simple and I tested it in some pretty good rain and had no problems. This is a working proto but it shows the idea.
It's two tent poles strapped to my luggage rack with the tent material sewn up so the poles slide into openings, and the extra material hangs down a bit to block sideways rain. I could open and close the door though in heavy rain the awning drooped a bit. I ended up cutting a small hole to allow it to drain better. There is a strap with a bit of elastic holding the two sides together so they don't slide off the poles.
If you have a different approach, or way to improve, share here.
I think the next step is some type of rubber or foam in between the tent pole and the rack so it doesn't slide.
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I had bought the tent poles from Alion Home Shade on ETSY and had a left over tent cover, but they sell material as well.
If you are looking for a more professional version search "ROADIE- The OVERNIGHTER SUV Window Tent with Bug Screen and Retractable Awning" on amazon though I can't say how well they work.